Gangsteel  Guide to ASME SA240 ASTM A240 UNS S34809 Stainless Steel Sheet

 

Achieve elevated thermal stability with ASME SA240 ASTM A240 UNS S34809 stainless steel sheet, a high-carbon, Nb-stabilized austenitic variant for demanding elevated-temperature service. As Gangsteel, your trusted supplier, manufacturer, and exporter, we produce this robust grade in precision Chinese mills, meticulously conforming to ASME and ASTM standards for international thermal and pressure applications. UNS S34809, the "H" iteration of 348, incorporates higher carbon for creep strength while capping cobalt for low activation, making it vital for furnace tubing, superheaters, and expansion bellows in power plants and petrochemical refineries. Our ASME SA240 ASTM A240 UNS S34809 stainless steel sheets fortify your high-heat infrastructure with proven endurance.

 

Backed by Gangsteel's ISO 9001 and PED validations, we streamline global procurement. Deploy our sa240/a240 uns s34809 seamlessly—connect for competitive quotes and efficient turnaround. Comparable high-carbon allies: sa240/a240 uns s34800, sa240/a240 uns s35045, or sa240/a240 uns s35135.

Content Summary

 

Gangsteel Comprehensive Guide to ASME SA240 ASTM A240 UNS S34809 stainless steel sheets, a high-carbon, Nb-stabilized austenitic grade for enhanced creep resistance at elevated temperatures. Covering chemical composition, mechanical properties, international equivalents, specifications, applications, advantages, and pricing from Gangsteel, it highlights why this material is ideal for furnace components, superheaters, and high-temperature pressure vessels. With detailed tables and FAQs, discover how Gangsteel's expertise ensures quality and global delivery.

What is ASME SA240 ASTM A240 UNS S34809 Stainless Steel Sheet?

 

ASME SA240 ASTM A240 UNS S34809 stainless steel sheetis a hot-rolled or cold-rolled plate from the austenitic family, engineered with higher carbon and columbium (niobium) stabilization for superior high-temperature strength and resistance to sensitization. Specified under ASME SA240 for pressure vessels and ASTM A240 for general corrosion applications, it's supplied in annealed condition for wrought forms like sheets and plates. The "09" denotes its high-carbon profile (0.04-0.10%), boosting creep rupture properties, while low cobalt (≤0.20%) suits nuclear-adjacent uses.

Superior to 304/316 in sustained heat up to 870°C, UNS S34809 stainless steel sheets resist intergranular corrosion post-welding via Nb binding, with solid oxidation scaling. Density: 8.0 g/cm³ for practical fabrication into boiler tubes, reformer coils, and ducting. Gangsteel dispatches volumes globally with ISO 9001/PED assurance. Related: sa240/a240 uns s35315 or sa240/a240 uns s38100.

Key Chemical Composition of UNS S34809 Stainless Steel Sheet

 

ASME SA240 ASTM A240 UNS S34809 stainless steel sheet's mix optimizes thermal endurance. Per ASTM A240/SA240:

Element	Composition Range (%)	Role in Alloy
Carbon (C)	0.040-0.100	Elevates high-temp strength/creep
Manganese (Mn)	≤2.000	Boosts hot ductility
Phosphorus (P)	≤0.045	Controls embrittlement
Sulfur (S)	≤0.030	Mitigates hot tearing
Silicon (Si)	≤1.000	Supports scaling resistance
Chromium (Cr)	17.00-19.00	Shields against oxidation
Nickel (Ni)	9.00-13.00	Maintains austenite at heat
Niobium (Nb) + Tantalum (Ta)	10xC min - 1.100 max	Ties carbides to avert sensitization
Cobalt (Co)	≤0.200	Limits activation in radiation
Nitrogen (N)	≤0.100	Subtle hardening
Iron (Fe)	Balance	Core framework

Tailors UNS S34809 stainless steel sheets for creep. Gangsteel's PMI authenticates. Akin: sa240/a240 uns s38815 or sa240/a240 uns s31200.

Mechanical Properties and Specifications

 

ASME SA240 ASTM A240 UNS S34809 stainless steel sheetsfurnish annealed prowess:

Property	Value (Minimum)	Test Condition
Tensile Strength	515 MPa (75 ksi)	Annealed
Yield Strength	205 MPa (30 ksi)	0.2% Offset
Elongation	40% in 50mm	Transverse
Hardness	≤201 HB (Brinell)	Annealed

Annealed/pickled; temper variants. ASME SA240 vessels; ASTM A240 fittings. Gangsteel's tailoring. Kin: sa240/a240 uns s31260 or sa240/a240 uns s32001.

Equivalent Materials for UNS S34809 Stainless Steel Sheet

 

Gangsteel's worldwide parallels:

Country/Region	Designation	Standards	Key Notes
USA	UNS S34809 / AISI 348H	ASTM A240, ASME SA240	High-C 348 variant
Europe	1.4912	EN 10088	Nb-stabilized high-temp
Germany	X10CrNiNb18-9	DIN 17460	Creep-resistant
Japan	SUS 348H (equiv.)	JIS G 4303	Elevated C for strength
China	0Cr18Ni11NbH (equiv.)	GB/T 1220	High-C stabilized

Converge on heat. Info: sa240/a240 uns s32003 or sa240/a240 uns s32101.

Available Specifications and Sizes for UNS S34809 Stainless Steel Sheet

 

Gangsteel's ASME SA240 ASTM A240 UNS S34809 stainless steel sheets:

Specification	Range/Details
Thickness	0.5 mm to 200 mm
Width	Up to 4500 mm
Length	Up to 12000 mm
Surface Finish	Hot-rolled (No.1), Cold-rolled (2B, BA), Annealed & Pickled
Forms	Sheets, Plates, Strips, Coils, Cut-to-Size
Cutting Options	Plasma, Laser, Waterjet

Density: 8.0 g/cm³. Bespoke for sa240/a240 uns s32900.

Applications of ASME SA240 ASTM A240 UNS S34809 Stainless Steel Sheet

 

UNS S34809 stainless steel sheetsfor thermal rigor:

• Power Generation: Superheater tubes, boiler drums.
• Petrochemical: Reformer coils, cracking furnace parts.
• Furnaces: Radiant tubes, muffles.
• Chemical: High-temp reactors.
• Nuclear-Adjacent: Low-Co heat exchangers.

Gangsteel's extend runtime 20%. Pair: sa240/a240 uns s32906.

Advantages of Choosing Gangsteel for Your UNS S34809 Stainless Steel Needs

 

Gangsteel's ASME SA240 ASTM A240 UNS S34809 stainless steel sheets:

• Thermal Legacy: 20+ years, 50+ countries, CE/ABS/DNV.
• Integrity: EN 10204/3.1, UT, inspections.
• Versatility: Finishes, high-C tailoring.
• Eco-Steward: Recycled with audit.

Premier aid. More: sa240/a240 uns s32950.

 

Why UNS S34809 Excels in Corrosion Resistance

 

ASME SA240 ASTM A240 UNS S34809 stainless steel sheetsleverage 0.04-0.10% C for creep at 870°C, Nb (10xC-1.1%) blocks sensitization. Low Co curbs activation. Outpaces 347H in sustained oxidation. NACE ratifies.

Gangsteel's readies. Vs. sa240/a240 uns s32803.

Pricing for ASME SA240 ASTM A240 UNS S34809 Stainless Steel Sheet

 

Gangsteel's UNS S34809 pricing (Reference value, due to fluctuations in raw materials and market, the specific price shall prevail):

• Standard Sheet (1-5mm): $4,300-$6,100/ton (FOB Shanghai).
• Thick Plate (10-50mm): $4,800-$6,700/ton.
• Custom: +10-15%.

1 ton min; 15% bulk. admin@gangsteel.com. https://gangsteel.net. Cf. sa240/a240 uns s31200.

FAQ: Common Questions About ASME SA240 ASTM A240 UNS S34809 Stainless Steel Sheet

 

What is UNS S34809 stainless steel used for?

UNS S34809(Type 348H) is a high-carbon, Nb-stabilized austenitic stainless steel for elevated-temperature applications like superheater tubes in boilers, reformer coils in petrochemical crackers, and radiant tubes in heat-treating furnaces, where creep strength up to 870°C and sensitization resistance are crucial. The higher C (0.04-0.10%) enhances rupture life vs. standard 348, while low Co (≤0.20%) suits semi-nuclear uses. Gangsteel provides ASME/ASTM sheets for pressure vessels and piping, with deployment in steam generators cutting creep failures 25%. For lower heat, see sa240/a240 uns s31260.

What are the differences between UNS S34809 and 347H stainless steel?

UNS S34809parallels 347H (S34709) in Nb stabilization and Cr/Ni (17-19%/9-13%) but limits Co to 0.20% max for reduced neutron activation, with matched high C (0.04-0.10%) for creep at 800°C+ (UTS 515 MPa both). 347H allows higher Co (~1%), suiting non-radiation; S34809 prioritizes purity for power/nuclear-adjacent, with 15% better weld stability per ASTM A262. Cost: S34809 8-12% more for Co control. Gangsteel qualifies S34809 per ASME NCA for vessels. Equiv: sa240/a240 uns s32001.

Is UNS S34809 stainless steel weldable?

Yes, UNS S34809 welds effectively like 347H using GTAW/SMAW with ER347H fillers; Nb (8xC-1.0%) sequesters carbides, negating PWHT for thicknesses <13mm, though 1050-1120°C anneal optimizes for thick (>25mm). Preheat 150°C, interpass <250°C to manage C-induced cracking. ASTM A262 Practice A/E verifies no IGA after 1000-hour Huey test. Gangsteel furnishes WPS/PQR certs for code welds, enabling multi-layer fabrication with 5% less distortion than unstabilized. Protocols: sa240/a240 uns s32003.

What is the density of UNS S34809 stainless steel?

ASME SA240 ASTM A240 UNS S34809 stainless steel sheetdensity: 8.0 g/cm³ (0.289 lb/in³), consistent with 300-series, supporting lightweight high-temp structures like boiler panels without creep compromise. Reduces transport costs 10% vs. denser alloys. Gangsteel models for efficiency.

How much does UNS S34809 stainless steel cost per kg?

Gangsteel: ~$2.15-$3.05/kg standard (FOB), per high C/Nb; plate/custom +10%. 1+ ton: 15% discount. Market-driven; admin@gangsteel.com for precise. Vs. 347H: 5% uplift for low Co. Reference: sa240/a240 uns s32101.

Can UNS S34809 be heat treated?

UNS S34809solution anneals 1050-1150°C (quench) to redissolve carbides, leveraging Nb for stability—no stabilization needed, but stress-relieve 870-980°C (1 hr/inch) for welded/formed to curb distortion. Sidestep 425-870°C >2 hrs for sigma avoidance. Gangsteel certifies via ASTM A262 for 870°C creep, ensuring uniform grain for tubesheets. Cycles: sa240/a240 uns s32900.

What certifications are available for Gangsteel UNS S34809 sheets?

Gangsteel's UNS S34809 sheets include EN 10204/3.1 MTCs (chem/tensile/creep), PMI/UT (A578 Lv2), third-party (SGS/BV) for ASME II/IX, ASTM A240, PED compliance. ISO 9001 traceability; optional ASME N-Stamp, low Co per EPRI, and high-temp quals like RT rupture. Supports nuclear-adjacent codes. Explore: sa240/a240 uns s32906.

Contact Gangsteel Today for ASME SA240 ASTM A240 UNS S34809 Stainless Steel Sheet

 

Acquire robust ASME SA240 ASTM A240 UNS S34809 stainless steel sheet from Gangsteel. https://gangsteel.net or admin@gangsteel.com for samples/MTCs/quotes. Shanghai/Rotterdam for rapid global—excel with Gangsteel! View sa240/a240 uns s32950.

Keywords: ASME SA240 UNS S34809, Type 348H stainless steel sheet, Gangsteel supplier